Question 1

Compared to C3 plants, C4 plants

Accepted Answer

A)  can continue to fix CO₂ even at relatively low CO₂ concentrations and high oxygen concentrations. 
B)  have higher rates of photorespiration. 
C)  do not use rubisco for carbon fixation. 
D)  grow better under cool, moist conditions. 
A)  can continue to fix CO₂ even at relatively low CO₂ concentrations and high oxygen concentrations. 
B)  have higher rates of photorespiration. 
C)  do not use rubisco for carbon fixation. 
D)  grow better under cool, moist conditions. A

Question 2

Please use the following information to answer the question(s) below.
A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Because the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed.
-Halobacterium has a photosynthetic membrane that appears purple. Its photosynthetic action spectrum is the inverse of the action spectrum for green plants. (That is, the Halobacterium action spectrum has a peak where the green plant action spectrum has a trough.) What wavelengths of light do the Halobacterium photosynthetic pigments absorb?

Accepted Answer

A)  red and yellow 
B)  blue, green, and red 
C)  green and yellow 
D)  red and green 
E)  blue and red 
A)  red and yellow 
B)  blue, green, and red 
C)  green and yellow 
D)  red and green 
E)  blue and red C

Question 3

Figure 8.2
-Use Figure 8.2 and the compounds labeled A, B, C, D, and E to answer the following question. Which molecule(s) of the Calvin cycle is (are) also found in glycolysis?

Accepted Answer

A)  B, C, E, and 3-phosphoglycerate 
B)  B, C, and E only 
C)  3-phosphoglycerate only 
D)  B, C, D, and 3-phosphoglycerate only 
E)  E only 
A)  B, C, E, and 3-phosphoglycerate 
B)  B, C, and E only 
C)  3-phosphoglycerate only 
D)  B, C, D, and 3-phosphoglycerate only 
E)  E only D

Question 4

Figure 8.2
-To identify the molecule that accepts CO₂, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO₂ or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO₂ acceptor? Study Figure 8.2 to help you in determining the correct answer.

Accepted Answer

A)  The CO₂ acceptor concentration would decrease when either the CO₂ or light is cut off. 
B)  The CO₂ acceptor concentration would increase when either the CO₂ or light is cut off. 
C)  The CO₂ acceptor concentration would increase when the CO₂ is cut off, but decrease when the light is cut off. 
D)  The CO₂ acceptor concentration would decrease when the CO₂ is cut off, but increase when the light is cut off. 
E)  The CO₂ acceptor concentration would stay the same regardless of the CO₂ or light. 
A)  The CO₂ acceptor concentration would decrease when either the CO₂ or light is cut off. 
B)  The CO₂ acceptor concentration would increase when either the CO₂ or light is cut off. 
C)  The CO₂ acceptor concentration would increase when the CO₂ is cut off, but decrease when the light is cut off. 
D)  The CO₂ acceptor concentration would decrease when the CO₂ is cut off, but increase when the light is cut off. 
E)  The CO₂ acceptor concentration would stay the same regardless of the CO₂ or light.

Question 5

The light reactions of photosynthesis supply the Calvin cycle with

Accepted Answer

A)  light energy. 
B)  C and ATP. 
C)  O₂ and NADPH. 
D)  ATP and NADPH. 
A)  light energy. 
B)  C and ATP. 
C)  O₂ and NADPH. 
D)  ATP and NADPH.

Question 6

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. What is the source of the extra ATP?

Accepted Answer

A)  photosystem II 
B)  photosystem I 
C)  cyclic electron flow 
D)  linear electron flow 
A)  photosystem II 
B)  photosystem I 
C)  cyclic electron flow 
D)  linear electron flow

Question 7

Please use the following information to answer the question(s) below.
A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Because the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed.
-A gardener is concerned that her greenhouse is getting too hot from too much light and seeks to shade her plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength. What color should she use to reduce overall light energy, but still maximize plant growth?

Accepted Answer

A)  green 
B)  blue 
C)  yellow 
D)  orange 
E)  white 
A)  green 
B)  blue 
C)  yellow 
D)  orange 
E)  white

Question 8

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

Accepted Answer

A)  red and yellow 
B)  blue and violet 
C)  green and yellow 
D)  blue, green, and red 
E)  green, blue, and yellow 
A)  red and yellow 
B)  blue and violet 
C)  green and yellow 
D)  blue, green, and red 
E)  green, blue, and yellow

Question 9

P680+ is said to be the strongest biological oxidizing agent. Given its function, why is this necessary?

Accepted Answer

A)  It is the receptor for the most excited electrons in either photosystem. 
B)  It is the molecule that transfers electrons to the photosynthetic electron transport chain. 
C)  It transfers its electrons directly to NADP+ to produce NADPH. 
D)  It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger affinity for electrons than oxygen has. 
E)  It has a positive charge. 
A)  It is the receptor for the most excited electrons in either photosystem. 
B)  It is the molecule that transfers electrons to the photosynthetic electron transport chain. 
C)  It transfers its electrons directly to NADP+ to produce NADPH. 
D)  It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger affinity for electrons than oxygen has. 
E)  It has a positive charge.

Question 10

Which process is most directly driven by light energy?

Accepted Answer

A)  creation of a pH gradient by pumping protons across the thylakoid membrane 
B)  reduction of NADP+ molecules 
C)  removal of electrons from chlorophyll molecules 
D)  ATP synthesis 
A)  creation of a pH gradient by pumping protons across the thylakoid membrane 
B)  reduction of NADP+ molecules 
C)  removal of electrons from chlorophyll molecules 
D)  ATP synthesis

Question 11

If plants are grown in the light with CO₂ containing heavy oxygen (18O), subsequent analysis will show that 18O incorporated in organic molecules first appears in

Accepted Answer

A)  the thylakoid space. 
B)  the thylakoid membranes. 
C)  the stroma. 
D)  photosystem II 
E)  the chloroplast intermembrane space. 
A)  the thylakoid space. 
B)  the thylakoid membranes. 
C)  the stroma. 
D)  photosystem II 
E)  the chloroplast intermembrane space.

Question 12

Figure 8.1
-Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. What wavelength of light is most effective in driving photosynthesis?

Accepted Answer

A)  420 nm 
B)  450 nm 
C)  500 nm 
D)  650 nm 
E)  700 nm 
A)  420 nm 
B)  450 nm 
C)  500 nm 
D)  650 nm 
E)  700 nm

Question 13

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be

Accepted Answer

A)  to determine if they have thylakoids in the chloroplasts. 
B)  to test for liberation of O₂ in the light. 
C)  to test for CO₂ fixation in the dark. 
D)  to the action spectrum for photosynthesis. 
A)  to determine if they have thylakoids in the chloroplasts. 
B)  to test for liberation of O₂ in the light. 
C)  to test for CO₂ fixation in the dark. 
D)  to the action spectrum for photosynthesis.

Question 14

Where does the Calvin cycle take place?

Accepted Answer

A)  stroma of the chloroplast 
B)  thylakoid membrane 
C)  outer membrane of the chloroplast 
D)  interior of the thylakoid (thylakoid space) 
A)  stroma of the chloroplast 
B)  thylakoid membrane 
C)  outer membrane of the chloroplast 
D)  interior of the thylakoid (thylakoid space)

Question 15

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Accepted Answer

A)  photosynthesis. 
B)  respiration. 
C)  both photosynthesis and cellular respiration. 
D)  neither photosynthesis nor respiration. 
E)  photorespiration. 
A)  photosynthesis. 
B)  respiration. 
C)  both photosynthesis and cellular respiration. 
D)  neither photosynthesis nor respiration. 
E)  photorespiration.

Question 16

Where do the enzymatic reactions of the Calvin cycle take place?

Accepted Answer

A)  stroma of the chloroplast 
B)  thylakoid membranes 
C)  matrix of the mitochondria 
D)  thylakoid space 
A)  stroma of the chloroplast 
B)  thylakoid membranes 
C)  matrix of the mitochondria 
D)  thylakoid space

Question 17

Figure 8.1
-Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Accepted Answer

A)  Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. 
B)  Bright sunlight destroys photosynthetic pigments. 
C)  Oxygen given off during photosynthesis interferes with the absorption of light. 
D)  Other pigments absorb light in addition to chlorophyll a. 
A)  Green and yellow wavelengths inhibit the absorption of red and blue wavelengths. 
B)  Bright sunlight destroys photosynthetic pigments. 
C)  Oxygen given off during photosynthesis interferes with the absorption of light. 
D)  Other pigments absorb light in addition to chlorophyll a.

Question 18

Figure 8.1
-Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. What colors of light are least effective in driving photosynthesis?

Accepted Answer

A)  violet-blue 
B)  green-yellow 
C)  yellow-orange 
D)  orange-red 
A)  violet-blue 
B)  green-yellow 
C)  yellow-orange 
D)  orange-red

Question 19

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Accepted Answer

A)  NADPH → O₂ → CO₂ 
B)  H₂O → NADPH → Calvin cycle 
C)  H₂O → photosystem I → photosystem II 
D)  NADPH → electron transport chain → O₂ 
A)  NADPH → O₂ → CO₂ 
B)  H₂O → NADPH → Calvin cycle 
C)  H₂O → photosystem I → photosystem II 
D)  NADPH → electron transport chain → O₂

Question 20

Which of the following statements about the relationship between photosynthesis and cellular respiration is true?

Accepted Answer

A)  In cellular respiration the biochemical pathways of photosynthesis run in reverse. 
B)  In photosynthesis the biochemical pathways of cellular respiration run in reverse. 
C)  Cellular respiration occurs only in animals and photosynthesis occurs only in plants. 
D)  There is a net consumption of ATP in cellular respiration and a net production of ATP in photosynthesis. 
E)  Cellular respiration is catabolic and photosynthesis is anabolic. 
A)  In cellular respiration the biochemical pathways of photosynthesis run in reverse. 
B)  In photosynthesis the biochemical pathways of cellular respiration run in reverse. 
C)  Cellular respiration occurs only in animals and photosynthesis occurs only in plants. 
D)  There is a net consumption of ATP in cellular respiration and a net production of ATP in photosynthesis. 
E)  Cellular respiration is catabolic and photosynthesis is anabolic.

Exam 8: Photosynthesis

Compared to C3 plants, C4 plants

Figure 8.2 -Use Figure 8.2 and the compounds labeled A, B, C, D, and E to answer the following question. Which molecule(s) of the Calvin cycle is (are) also found in glycolysis?

The light reactions of photosynthesis supply the Calvin cycle with

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. What is the source of the extra ATP?

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

P680+ is said to be the strongest biological oxidizing agent. Given its function, why is this necessary?

Which process is most directly driven by light energy?

If plants are grown in the light with CO₂ containing heavy oxygen (18O), subsequent analysis will show that 18O incorporated in organic molecules first appears in

Figure 8.1 -Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. What wavelength of light is most effective in driving photosynthesis?

Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be

Where does the Calvin cycle take place?

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Where do the enzymatic reactions of the Calvin cycle take place?

Figure 8.1 -Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Figure 8.1 -Figure 8.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. What colors of light are least effective in driving photosynthesis?

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Which of the following statements about the relationship between photosynthesis and cellular respiration is true?

Introduction: Evolution and the Foundations of Biology

The Chemical Context of Life

Carbon and the Molecular Diversity of Life

A Tour of the Cell

Membrane Transport and Cell Signaling

An Introduction to Metabolism

Cellular Respiration and Fermentation

The Cell Cycle

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

Gene Expression: From Gene to Protein

Regulation of Gene Expression

Development, Stem Cells, and Cancer

Viruses

Genomes and Their Evolution

Descent With Modification

Phylogeny

The Evolution of Populations

The Origin of Species

Broad Patterns of Evolution

Early Life and the Diversification of Prokaryotes

The Origin and Diversification of Eukaryotes

The Colonization of Land by Plants and Fungi

The Rise of Animal Diversity

Plant Structure and Growth

Resource Acquisition, Nutrition, and Transport in Vascular Plants

Reproduction and Domestication of Flowering Plants

Plant Responses to Internal and External Signals

Homeostasis and Endocrine Signaling

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Reproduction and Development

Neurons, Synapses, and Signaling

Nervous and Sensory Systems

Motor Mechanisms and Behavior

Population Ecology and the Distribution of Organisms

Species Interactions

Ecosystems and Energy

Global Ecology and Conservation Biology

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